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The VKT-line or Viipuri–Kuparsaari–Taipale line (Finnish: VKT-linja, Swedish: VKT-linjen) was a Finnish defensive line on Karelian Isthmus during the Continuation War, spanning from Viipuri (Vyborg) through Tali and Kuparsaari along the northern shore of Vuoksi River, Suvanto and Taipaleenjoki to Taipale on the western shore of Lake Ladoga, using natural benefits of the eastern part of the destroyed Mannerheim Line.